Electrically-driven rotary pump



I. W. W. DRYSDALE, IR., AND I. YOUNG.

ELECTRICALLY DRIVEN ROTARY PUMP.

APPLICATION FILED MAR. 15,*1920.

IEffLIented Oct. 12, 1920.

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PATENT-orner.

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uApplication led March 15.

To ZZ whom t may concern.'

Be it lm'own that we, JOHN WHITEHEAD WILSON yDiivsonnn, Jr.,'and JOHN YOUNG, both subjects of the King of Great Britain and Ireland, both residing at Bon-Accord Works, FerryltoadyYoker, near Glasgow,

Scotland, have invented certain new and useful Improvements in Electrically-Driven Rotary Pumps; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art ,to which it appertaiiis to make and use the same, ref-N erence being had to the accompanying drawings,and to letters or figures of reference -marked thereon, which form apart of this specification.

This invention relates to electricallydriven rotary pumps which run continuously or occasionally under water with the water level at a considerable height above the top of the pump. l

The object of the invention is to obviate the necessity of employing (1) a motor specially constructed 'to stand submersion or` (2) a very longdriving shaft, for the purpose of maintaining the motor above the water level while the unit -is running with the water level above the top of the pump.

Our invention-Which will be dened in the annexed claim-consists in a construction of electrically-driven rotary pump unit -which will be described in the following specification. This construction involves the placing of the electric motor above the pump and the inclosing of it in a beller chamber hermetically sealed except at the bottom where there passes out o it a shaft' by which the pump'is driven bythe motor, this bell or chamber being carried down without openings. to a level below the bottom of the motor and being so dimensioned that, with a .water level without it above the top of the motor but within a predetermined distance therefrom, the water level within it is below the motor. 1-

Our invention may be applied, with advantage, to electricallydriven rotary' pumps employed in mine draining, deep well pumping, caisson or marine salvage pumping, or as emergency bilge pumps on shipboard. The invention may also be applied, with advantage, to electrically-driven rotary pumps operating in explosive atmos- Speoi'cation of Letters latent.

rat-@need oct. 1e, 1920. i920. semi no. .$66,055.

pheres, the pump unit in such a case being immer-'sed in a tank or chamber of water.

, The accompanying drawing illustrates la convenient manner of carrying vour invehtloninto eect.

Figurel show s in elevation (with a small portion in section)l an electrically-driven pump according to our invention.

Fig. 2 is a plan of the same.

a is apump which is of the centrifugal type; b is its inlet port. ounted on the casing of the pump is .a stool d which itself supports an outer cylinder e and an inner cylinder f. The stator of the motor g which drives the pump is supported on the upper end of the cylinder f. he rotor of the motor is keyed on the shaft/71J which is connected at to 'the shaft mwhich carries the wheel or impeller of the pump. The pump is thus driven by the motor. l

The cylinder e is closed at the top and acts as a bell to prevent the immersion of the motor as hereinbeore mentioned. If the motor .is of a type involving a commutator or slip rings, a handhole o, or handholes may be provided for use in inspecting, adjusting, and replacing the brushes and gear, but, when the motor is of a type without commutator or -ange g of the stool which supports the cylinders e and f.'

hen the pump is submerged, water enters the openings r and rises within the cylinder e both inside and outside the cylinder f until the pressure of air within the upper part of the cylinder e is suiicient to lprevent further riseof the water. The arrangement issuch that the water can rise outside the cylinder e to a pre-determined height above the top ofthe motor without rising inside the cylinder e above a point at which it will cover an' portion of the motor liable to be damage by water. The desired eifect can be obtained by restricting, if

necessary, the volume of air in the upper port and c its discharge part of the cylinder e, while allowing ample volume in the lower part.

-Except for the handholesl p which, as above stated, may be omitted, there are no openings above the openings 1" by which water can gain access to the interior ofthe cylinder e.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is :-v

The combination, with a rotary pump comprising a stator and a rotating wheel, of an electric motor comprising a stator and a rotor, a stool supported. on top of said pump stator, an inner cylinder supported on the top of said stool, the motor stator being supported on the top of Said cylinder, an outer cylinder inclosing said motor and said inner cylinder and hermetically sealed except at the bottom and carried down to a level below the bottom of said motor and supported on 4said stool, and a .shaft within said innerA cylinder and coupled to the said pump wheel and to the rotor of said motor.

We hereby sign our names to this specifcation.

JOHN wHiTEHElD y WILSON DRYSDALE, JUNE.,

JOHNV YOUNG. 

